<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>在线聊天</title>
        <link href="NES.css" rel="stylesheet"/>
    <!--    <link href="https://fonts.googleapis.com/css?family=Press+Start+2P" rel="stylesheet">-->
    <!--    <link href="https://unpkg.com/nes.css/css/nes.css" rel="stylesheet"/>-->
    <style>
        @font-face {
            font-family: "pix";
            src: url("DottedSongtiSquareRegular.otf");
        }

        html, body, pre, code, kbd, samp {
            font-family: "pix";
            font-weight: bold;
            font-size: 35px;
        }
    </style>
</head>
<style>
</style>
<body>

<div id="main" style="width: 1200px;height:400px;"></div>
Welcome<br/><input id="text" type="text"/>
<button onclick="send()">发送消息</button>
<hr/>
<button onclick="closeWebSocket()">关闭WebSocket连接</button>
<hr/>
<div id="message"></div>

</body>

<script type="text/javascript">
    var websocket = null;
    //判断当前浏览器是否支持WebSocket
    if ('WebSocket' in window) {
        //改成你的地址
        websocket = new WebSocket("ws://127.0.0.1:8080/ws");
    } else {
        alert('当前浏览器 Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function () {
        setMessageInnerHTML("WebSocket连接发生错误");
    };

    //连接成功建立的回调方法
    websocket.onopen = function () {
        setMessageInnerHTML("WebSocket连接成功");
    }
    var U01data, Uidata, Usdata
    //接收到消息的回调方法
    websocket.onmessage = function (event) {
        console.log(event);
        setMessageInnerHTML(event);
        setechart()
    }

    //连接关闭的回调方法
    websocket.onclose = function () {
        setMessageInnerHTML("WebSocket连接关闭");
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function () {
        closeWebSocket();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭WebSocket连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send('{"msg":"' + message + '"}');
        setMessageInnerHTML(message + "&#13;");
    }
</script>
</html>